drivers/block/swim3.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
swim3_end_request
swim3_select
swim3_action
swim3_readbit
swim3_queue_rq
set_timeout
scan_track
seek_track
init_dma
setup_transfer
act
scan_timeout
seek_timeout
settle_timeout
xfer_timeout
swim3_interrupt
grab_drive
release_drive
fd_eject
floppy_locked_ioctl
floppy_ioctl
floppy_open
floppy_unlocked_open
floppy_release
floppy_check_events
floppy_revalidate
swim3_mb_event
swim3_add_device
swim3_attach
swim3_init
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for the SWIM3 (Super Woz Integrated Machine 3)
   4  * floppy controller found on Power Macintoshes.
   5  *
   6  * Copyright (C) 1996 Paul Mackerras.
   7  */
   8 
   9 /*
  10  * TODO:
  11  * handle 2 drives
  12  * handle GCR disks
  13  */
  14 
  15 #undef DEBUG
  16 
  17 #include <linux/stddef.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched/signal.h>
  20 #include <linux/timer.h>
  21 #include <linux/delay.h>
  22 #include <linux/fd.h>
  23 #include <linux/ioctl.h>
  24 #include <linux/blk-mq.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/mutex.h>
  27 #include <linux/module.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/wait.h>
  30 #include <asm/io.h>
  31 #include <asm/dbdma.h>
  32 #include <asm/prom.h>
  33 #include <linux/uaccess.h>
  34 #include <asm/mediabay.h>
  35 #include <asm/machdep.h>
  36 #include <asm/pmac_feature.h>
  37 
  38 #define MAX_FLOPPIES    2
  39 
  40 static DEFINE_MUTEX(swim3_mutex);
  41 static struct gendisk *disks[MAX_FLOPPIES];
  42 
  43 enum swim_state {
  44         idle,
  45         locating,
  46         seeking,
  47         settling,
  48         do_transfer,
  49         jogging,
  50         available,
  51         revalidating,
  52         ejecting
  53 };
  54 
  55 #define REG(x)  unsigned char x; char x ## _pad[15];
  56 
  57 /*
  58  * The names for these registers mostly represent speculation on my part.
  59  * It will be interesting to see how close they are to the names Apple uses.
  60  */
  61 struct swim3 {
  62         REG(data);
  63         REG(timer);             /* counts down at 1MHz */
  64         REG(error);
  65         REG(mode);
  66         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
  67         REG(setup);
  68         REG(control);           /* writing bits clears them */
  69         REG(status);            /* writing bits sets them in control */
  70         REG(intr);
  71         REG(nseek);             /* # tracks to seek */
  72         REG(ctrack);            /* current track number */
  73         REG(csect);             /* current sector number */
  74         REG(gap3);              /* size of gap 3 in track format */
  75         REG(sector);            /* sector # to read or write */
  76         REG(nsect);             /* # sectors to read or write */
  77         REG(intr_enable);
  78 };
  79 
  80 #define control_bic     control
  81 #define control_bis     status
  82 
  83 /* Bits in select register */
  84 #define CA_MASK         7
  85 #define LSTRB           8
  86 
  87 /* Bits in control register */
  88 #define DO_SEEK         0x80
  89 #define FORMAT          0x40
  90 #define SELECT          0x20
  91 #define WRITE_SECTORS   0x10
  92 #define DO_ACTION       0x08
  93 #define DRIVE2_ENABLE   0x04
  94 #define DRIVE_ENABLE    0x02
  95 #define INTR_ENABLE     0x01
  96 
  97 /* Bits in status register */
  98 #define FIFO_1BYTE      0x80
  99 #define FIFO_2BYTE      0x40
 100 #define ERROR           0x20
 101 #define DATA            0x08
 102 #define RDDATA          0x04
 103 #define INTR_PENDING    0x02
 104 #define MARK_BYTE       0x01
 105 
 106 /* Bits in intr and intr_enable registers */
 107 #define ERROR_INTR      0x20
 108 #define DATA_CHANGED    0x10
 109 #define TRANSFER_DONE   0x08
 110 #define SEEN_SECTOR     0x04
 111 #define SEEK_DONE       0x02
 112 #define TIMER_DONE      0x01
 113 
 114 /* Bits in error register */
 115 #define ERR_DATA_CRC    0x80
 116 #define ERR_ADDR_CRC    0x40
 117 #define ERR_OVERRUN     0x04
 118 #define ERR_UNDERRUN    0x01
 119 
 120 /* Bits in setup register */
 121 #define S_SW_RESET      0x80
 122 #define S_GCR_WRITE     0x40
 123 #define S_IBM_DRIVE     0x20
 124 #define S_TEST_MODE     0x10
 125 #define S_FCLK_DIV2     0x08
 126 #define S_GCR           0x04
 127 #define S_COPY_PROT     0x02
 128 #define S_INV_WDATA     0x01
 129 
 130 /* Select values for swim3_action */
 131 #define SEEK_POSITIVE   0
 132 #define SEEK_NEGATIVE   4
 133 #define STEP            1
 134 #define MOTOR_ON        2
 135 #define MOTOR_OFF       6
 136 #define INDEX           3
 137 #define EJECT           7
 138 #define SETMFM          9
 139 #define SETGCR          13
 140 
 141 /* Select values for swim3_select and swim3_readbit */
 142 #define STEP_DIR        0
 143 #define STEPPING        1
 144 #define MOTOR_ON        2
 145 #define RELAX           3       /* also eject in progress */
 146 #define READ_DATA_0     4
 147 #define ONEMEG_DRIVE    5
 148 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
 149 #define DRIVE_PRESENT   7
 150 #define DISK_IN         8
 151 #define WRITE_PROT      9
 152 #define TRACK_ZERO      10
 153 #define TACHO           11
 154 #define READ_DATA_1     12
 155 #define GCR_MODE        13
 156 #define SEEK_COMPLETE   14
 157 #define TWOMEG_MEDIA    15
 158 
 159 /* Definitions of values used in writing and formatting */
 160 #define DATA_ESCAPE     0x99
 161 #define GCR_SYNC_EXC    0x3f
 162 #define GCR_SYNC_CONV   0x80
 163 #define GCR_FIRST_MARK  0xd5
 164 #define GCR_SECOND_MARK 0xaa
 165 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
 166 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
 167 #define GCR_SLIP_BYTE   "\x27\xaa"
 168 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
 169 
 170 #define DATA_99         "\x99\x99"
 171 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
 172 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
 173 #define MFM_GAP_LEN     12
 174 
 175 struct floppy_state {
 176         enum swim_state state;
 177         struct swim3 __iomem *swim3;    /* hardware registers */
 178         struct dbdma_regs __iomem *dma; /* DMA controller registers */
 179         int     swim3_intr;     /* interrupt number for SWIM3 */
 180         int     dma_intr;       /* interrupt number for DMA channel */
 181         int     cur_cyl;        /* cylinder head is on, or -1 */
 182         int     cur_sector;     /* last sector we saw go past */
 183         int     req_cyl;        /* the cylinder for the current r/w request */
 184         int     head;           /* head number ditto */
 185         int     req_sector;     /* sector number ditto */
 186         int     scount;         /* # sectors we're transferring at present */
 187         int     retries;
 188         int     settle_time;
 189         int     secpercyl;      /* disk geometry information */
 190         int     secpertrack;
 191         int     total_secs;
 192         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
 193         struct dbdma_cmd *dma_cmd;
 194         int     ref_count;
 195         int     expect_cyl;
 196         struct timer_list timeout;
 197         int     timeout_pending;
 198         int     ejected;
 199         wait_queue_head_t wait;
 200         int     wanted;
 201         struct macio_dev *mdev;
 202         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
 203         int     index;
 204         struct request *cur_req;
 205         struct blk_mq_tag_set tag_set;
 206 };
 207 
 208 #define swim3_err(fmt, arg...)  dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 209 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 210 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 211 
 212 #ifdef DEBUG
 213 #define swim3_dbg(fmt, arg...)  dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
 214 #else
 215 #define swim3_dbg(fmt, arg...)  do { } while(0)
 216 #endif
 217 
 218 static struct floppy_state floppy_states[MAX_FLOPPIES];
 219 static int floppy_count = 0;
 220 static DEFINE_SPINLOCK(swim3_lock);
 221 
 222 static unsigned short write_preamble[] = {
 223         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
 224         0, 0, 0, 0, 0, 0,                       /* sync field */
 225         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
 226         0x990f                                  /* no escape for 512 bytes */
 227 };
 228 
 229 static unsigned short write_postamble[] = {
 230         0x9904,                                 /* insert CRC */
 231         0x4e4e, 0x4e4e,
 232         0x9908,                                 /* stop writing */
 233         0, 0, 0, 0, 0, 0
 234 };
 235 
 236 static void seek_track(struct floppy_state *fs, int n);
 237 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 238 static void act(struct floppy_state *fs);
 239 static void scan_timeout(struct timer_list *t);
 240 static void seek_timeout(struct timer_list *t);
 241 static void settle_timeout(struct timer_list *t);
 242 static void xfer_timeout(struct timer_list *t);
 243 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
 244 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 245 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 246                       int interruptible);
 247 static void release_drive(struct floppy_state *fs);
 248 static int fd_eject(struct floppy_state *fs);
 249 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 250                         unsigned int cmd, unsigned long param);
 251 static int floppy_open(struct block_device *bdev, fmode_t mode);
 252 static void floppy_release(struct gendisk *disk, fmode_t mode);
 253 static unsigned int floppy_check_events(struct gendisk *disk,
 254                                         unsigned int clearing);
 255 static int floppy_revalidate(struct gendisk *disk);
 256 
 257 static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes)
 258 {
 259         struct request *req = fs->cur_req;
 260 
 261         swim3_dbg("  end request, err=%d nr_bytes=%d, cur_req=%p\n",
 262                   err, nr_bytes, req);
 263 
 264         if (err)
 265                 nr_bytes = blk_rq_cur_bytes(req);
 266         if (blk_update_request(req, err, nr_bytes))
 267                 return true;
 268         __blk_mq_end_request(req, err);
 269         fs->cur_req = NULL;
 270         return false;
 271 }
 272 
 273 static void swim3_select(struct floppy_state *fs, int sel)
 274 {
 275         struct swim3 __iomem *sw = fs->swim3;
 276 
 277         out_8(&sw->select, RELAX);
 278         if (sel & 8)
 279                 out_8(&sw->control_bis, SELECT);
 280         else
 281                 out_8(&sw->control_bic, SELECT);
 282         out_8(&sw->select, sel & CA_MASK);
 283 }
 284 
 285 static void swim3_action(struct floppy_state *fs, int action)
 286 {
 287         struct swim3 __iomem *sw = fs->swim3;
 288 
 289         swim3_select(fs, action);
 290         udelay(1);
 291         out_8(&sw->select, sw->select | LSTRB);
 292         udelay(2);
 293         out_8(&sw->select, sw->select & ~LSTRB);
 294         udelay(1);
 295 }
 296 
 297 static int swim3_readbit(struct floppy_state *fs, int bit)
 298 {
 299         struct swim3 __iomem *sw = fs->swim3;
 300         int stat;
 301 
 302         swim3_select(fs, bit);
 303         udelay(1);
 304         stat = in_8(&sw->status);
 305         return (stat & DATA) == 0;
 306 }
 307 
 308 static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx,
 309                                    const struct blk_mq_queue_data *bd)
 310 {
 311         struct floppy_state *fs = hctx->queue->queuedata;
 312         struct request *req = bd->rq;
 313         unsigned long x;
 314 
 315         spin_lock_irq(&swim3_lock);
 316         if (fs->cur_req || fs->state != idle) {
 317                 spin_unlock_irq(&swim3_lock);
 318                 return BLK_STS_DEV_RESOURCE;
 319         }
 320         blk_mq_start_request(req);
 321         fs->cur_req = req;
 322         if (fs->mdev->media_bay &&
 323             check_media_bay(fs->mdev->media_bay) != MB_FD) {
 324                 swim3_dbg("%s", "  media bay absent, dropping req\n");
 325                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 326                 goto out;
 327         }
 328         if (fs->ejected) {
 329                 swim3_dbg("%s", "  disk ejected\n");
 330                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 331                 goto out;
 332         }
 333         if (rq_data_dir(req) == WRITE) {
 334                 if (fs->write_prot < 0)
 335                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 336                 if (fs->write_prot) {
 337                         swim3_dbg("%s", "  try to write, disk write protected\n");
 338                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 339                         goto out;
 340                 }
 341         }
 342 
 343         /*
 344          * Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be
 345          * 64 bits, but it will never go past 32 bits for this driver anyway, so
 346          * we can safely cast it down and not have to do a 64/32 division
 347          */
 348         fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
 349         x = ((long)blk_rq_pos(req)) % fs->secpercyl;
 350         fs->head = x / fs->secpertrack;
 351         fs->req_sector = x % fs->secpertrack + 1;
 352         fs->state = do_transfer;
 353         fs->retries = 0;
 354 
 355         act(fs);
 356 
 357 out:
 358         spin_unlock_irq(&swim3_lock);
 359         return BLK_STS_OK;
 360 }
 361 
 362 static void set_timeout(struct floppy_state *fs, int nticks,
 363                         void (*proc)(struct timer_list *t))
 364 {
 365         if (fs->timeout_pending)
 366                 del_timer(&fs->timeout);
 367         fs->timeout.expires = jiffies + nticks;
 368         fs->timeout.function = proc;
 369         add_timer(&fs->timeout);
 370         fs->timeout_pending = 1;
 371 }
 372 
 373 static inline void scan_track(struct floppy_state *fs)
 374 {
 375         struct swim3 __iomem *sw = fs->swim3;
 376 
 377         swim3_select(fs, READ_DATA_0);
 378         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
 379         in_8(&sw->error);
 380         out_8(&sw->intr_enable, SEEN_SECTOR);
 381         out_8(&sw->control_bis, DO_ACTION);
 382         /* enable intr when track found */
 383         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
 384 }
 385 
 386 static inline void seek_track(struct floppy_state *fs, int n)
 387 {
 388         struct swim3 __iomem *sw = fs->swim3;
 389 
 390         if (n >= 0) {
 391                 swim3_action(fs, SEEK_POSITIVE);
 392                 sw->nseek = n;
 393         } else {
 394                 swim3_action(fs, SEEK_NEGATIVE);
 395                 sw->nseek = -n;
 396         }
 397         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
 398         swim3_select(fs, STEP);
 399         in_8(&sw->error);
 400         /* enable intr when seek finished */
 401         out_8(&sw->intr_enable, SEEK_DONE);
 402         out_8(&sw->control_bis, DO_SEEK);
 403         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
 404         fs->settle_time = 0;
 405 }
 406 
 407 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
 408                             void *buf, int count)
 409 {
 410         cp->req_count = cpu_to_le16(count);
 411         cp->command = cpu_to_le16(cmd);
 412         cp->phy_addr = cpu_to_le32(virt_to_bus(buf));
 413         cp->xfer_status = 0;
 414 }
 415 
 416 static inline void setup_transfer(struct floppy_state *fs)
 417 {
 418         int n;
 419         struct swim3 __iomem *sw = fs->swim3;
 420         struct dbdma_cmd *cp = fs->dma_cmd;
 421         struct dbdma_regs __iomem *dr = fs->dma;
 422         struct request *req = fs->cur_req;
 423 
 424         if (blk_rq_cur_sectors(req) <= 0) {
 425                 swim3_warn("%s", "Transfer 0 sectors ?\n");
 426                 return;
 427         }
 428         if (rq_data_dir(req) == WRITE)
 429                 n = 1;
 430         else {
 431                 n = fs->secpertrack - fs->req_sector + 1;
 432                 if (n > blk_rq_cur_sectors(req))
 433                         n = blk_rq_cur_sectors(req);
 434         }
 435 
 436         swim3_dbg("  setup xfer at sect %d (of %d) head %d for %d\n",
 437                   fs->req_sector, fs->secpertrack, fs->head, n);
 438 
 439         fs->scount = n;
 440         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
 441         out_8(&sw->sector, fs->req_sector);
 442         out_8(&sw->nsect, n);
 443         out_8(&sw->gap3, 0);
 444         out_le32(&dr->cmdptr, virt_to_bus(cp));
 445         if (rq_data_dir(req) == WRITE) {
 446                 /* Set up 3 dma commands: write preamble, data, postamble */
 447                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
 448                 ++cp;
 449                 init_dma(cp, OUTPUT_MORE, bio_data(req->bio), 512);
 450                 ++cp;
 451                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
 452         } else {
 453                 init_dma(cp, INPUT_LAST, bio_data(req->bio), n * 512);
 454         }
 455         ++cp;
 456         out_le16(&cp->command, DBDMA_STOP);
 457         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 458         in_8(&sw->error);
 459         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 460         if (rq_data_dir(req) == WRITE)
 461                 out_8(&sw->control_bis, WRITE_SECTORS);
 462         in_8(&sw->intr);
 463         out_le32(&dr->control, (RUN << 16) | RUN);
 464         /* enable intr when transfer complete */
 465         out_8(&sw->intr_enable, TRANSFER_DONE);
 466         out_8(&sw->control_bis, DO_ACTION);
 467         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
 468 }
 469 
 470 static void act(struct floppy_state *fs)
 471 {
 472         for (;;) {
 473                 swim3_dbg("  act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
 474                           fs->state, fs->req_cyl, fs->cur_cyl);
 475 
 476                 switch (fs->state) {
 477                 case idle:
 478                         return;         /* XXX shouldn't get here */
 479 
 480                 case locating:
 481                         if (swim3_readbit(fs, TRACK_ZERO)) {
 482                                 swim3_dbg("%s", "    locate track 0\n");
 483                                 fs->cur_cyl = 0;
 484                                 if (fs->req_cyl == 0)
 485                                         fs->state = do_transfer;
 486                                 else
 487                                         fs->state = seeking;
 488                                 break;
 489                         }
 490                         scan_track(fs);
 491                         return;
 492 
 493                 case seeking:
 494                         if (fs->cur_cyl < 0) {
 495                                 fs->expect_cyl = -1;
 496                                 fs->state = locating;
 497                                 break;
 498                         }
 499                         if (fs->req_cyl == fs->cur_cyl) {
 500                                 swim3_warn("%s", "Whoops, seeking 0\n");
 501                                 fs->state = do_transfer;
 502                                 break;
 503                         }
 504                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
 505                         return;
 506 
 507                 case settling:
 508                         /* check for SEEK_COMPLETE after 30ms */
 509                         fs->settle_time = (HZ + 32) / 33;
 510                         set_timeout(fs, fs->settle_time, settle_timeout);
 511                         return;
 512 
 513                 case do_transfer:
 514                         if (fs->cur_cyl != fs->req_cyl) {
 515                                 if (fs->retries > 5) {
 516                                         swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
 517                                                   fs->req_cyl, fs->cur_cyl);
 518                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 519                                         fs->state = idle;
 520                                         return;
 521                                 }
 522                                 fs->state = seeking;
 523                                 break;
 524                         }
 525                         setup_transfer(fs);
 526                         return;
 527 
 528                 case jogging:
 529                         seek_track(fs, -5);
 530                         return;
 531 
 532                 default:
 533                         swim3_err("Unknown state %d\n", fs->state);
 534                         return;
 535                 }
 536         }
 537 }
 538 
 539 static void scan_timeout(struct timer_list *t)
 540 {
 541         struct floppy_state *fs = from_timer(fs, t, timeout);
 542         struct swim3 __iomem *sw = fs->swim3;
 543         unsigned long flags;
 544 
 545         swim3_dbg("* scan timeout, state=%d\n", fs->state);
 546 
 547         spin_lock_irqsave(&swim3_lock, flags);
 548         fs->timeout_pending = 0;
 549         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 550         out_8(&sw->select, RELAX);
 551         out_8(&sw->intr_enable, 0);
 552         fs->cur_cyl = -1;
 553         if (fs->retries > 5) {
 554                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 555                 fs->state = idle;
 556         } else {
 557                 fs->state = jogging;
 558                 act(fs);
 559         }
 560         spin_unlock_irqrestore(&swim3_lock, flags);
 561 }
 562 
 563 static void seek_timeout(struct timer_list *t)
 564 {
 565         struct floppy_state *fs = from_timer(fs, t, timeout);
 566         struct swim3 __iomem *sw = fs->swim3;
 567         unsigned long flags;
 568 
 569         swim3_dbg("* seek timeout, state=%d\n", fs->state);
 570 
 571         spin_lock_irqsave(&swim3_lock, flags);
 572         fs->timeout_pending = 0;
 573         out_8(&sw->control_bic, DO_SEEK);
 574         out_8(&sw->select, RELAX);
 575         out_8(&sw->intr_enable, 0);
 576         swim3_err("%s", "Seek timeout\n");
 577         swim3_end_request(fs, BLK_STS_IOERR, 0);
 578         fs->state = idle;
 579         spin_unlock_irqrestore(&swim3_lock, flags);
 580 }
 581 
 582 static void settle_timeout(struct timer_list *t)
 583 {
 584         struct floppy_state *fs = from_timer(fs, t, timeout);
 585         struct swim3 __iomem *sw = fs->swim3;
 586         unsigned long flags;
 587 
 588         swim3_dbg("* settle timeout, state=%d\n", fs->state);
 589 
 590         spin_lock_irqsave(&swim3_lock, flags);
 591         fs->timeout_pending = 0;
 592         if (swim3_readbit(fs, SEEK_COMPLETE)) {
 593                 out_8(&sw->select, RELAX);
 594                 fs->state = locating;
 595                 act(fs);
 596                 goto unlock;
 597         }
 598         out_8(&sw->select, RELAX);
 599         if (fs->settle_time < 2*HZ) {
 600                 ++fs->settle_time;
 601                 set_timeout(fs, 1, settle_timeout);
 602                 goto unlock;
 603         }
 604         swim3_err("%s", "Seek settle timeout\n");
 605         swim3_end_request(fs, BLK_STS_IOERR, 0);
 606         fs->state = idle;
 607  unlock:
 608         spin_unlock_irqrestore(&swim3_lock, flags);
 609 }
 610 
 611 static void xfer_timeout(struct timer_list *t)
 612 {
 613         struct floppy_state *fs = from_timer(fs, t, timeout);
 614         struct swim3 __iomem *sw = fs->swim3;
 615         struct dbdma_regs __iomem *dr = fs->dma;
 616         unsigned long flags;
 617         int n;
 618 
 619         swim3_dbg("* xfer timeout, state=%d\n", fs->state);
 620 
 621         spin_lock_irqsave(&swim3_lock, flags);
 622         fs->timeout_pending = 0;
 623         out_le32(&dr->control, RUN << 16);
 624         /* We must wait a bit for dbdma to stop */
 625         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
 626                 udelay(1);
 627         out_8(&sw->intr_enable, 0);
 628         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 629         out_8(&sw->select, RELAX);
 630         swim3_err("Timeout %sing sector %ld\n",
 631                (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
 632                (long)blk_rq_pos(fs->cur_req));
 633         swim3_end_request(fs, BLK_STS_IOERR, 0);
 634         fs->state = idle;
 635         spin_unlock_irqrestore(&swim3_lock, flags);
 636 }
 637 
 638 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
 639 {
 640         struct floppy_state *fs = (struct floppy_state *) dev_id;
 641         struct swim3 __iomem *sw = fs->swim3;
 642         int intr, err, n;
 643         int stat, resid;
 644         struct dbdma_regs __iomem *dr;
 645         struct dbdma_cmd *cp;
 646         unsigned long flags;
 647         struct request *req = fs->cur_req;
 648 
 649         swim3_dbg("* interrupt, state=%d\n", fs->state);
 650 
 651         spin_lock_irqsave(&swim3_lock, flags);
 652         intr = in_8(&sw->intr);
 653         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
 654         if ((intr & ERROR_INTR) && fs->state != do_transfer)
 655                 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
 656                           fs->state, rq_data_dir(req), intr, err);
 657         switch (fs->state) {
 658         case locating:
 659                 if (intr & SEEN_SECTOR) {
 660                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
 661                         out_8(&sw->select, RELAX);
 662                         out_8(&sw->intr_enable, 0);
 663                         del_timer(&fs->timeout);
 664                         fs->timeout_pending = 0;
 665                         if (sw->ctrack == 0xff) {
 666                                 swim3_err("%s", "Seen sector but cyl=ff?\n");
 667                                 fs->cur_cyl = -1;
 668                                 if (fs->retries > 5) {
 669                                         swim3_end_request(fs, BLK_STS_IOERR, 0);
 670                                         fs->state = idle;
 671                                 } else {
 672                                         fs->state = jogging;
 673                                         act(fs);
 674                                 }
 675                                 break;
 676                         }
 677                         fs->cur_cyl = sw->ctrack;
 678                         fs->cur_sector = sw->csect;
 679                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
 680                                 swim3_err("Expected cyl %d, got %d\n",
 681                                           fs->expect_cyl, fs->cur_cyl);
 682                         fs->state = do_transfer;
 683                         act(fs);
 684                 }
 685                 break;
 686         case seeking:
 687         case jogging:
 688                 if (sw->nseek == 0) {
 689                         out_8(&sw->control_bic, DO_SEEK);
 690                         out_8(&sw->select, RELAX);
 691                         out_8(&sw->intr_enable, 0);
 692                         del_timer(&fs->timeout);
 693                         fs->timeout_pending = 0;
 694                         if (fs->state == seeking)
 695                                 ++fs->retries;
 696                         fs->state = settling;
 697                         act(fs);
 698                 }
 699                 break;
 700         case settling:
 701                 out_8(&sw->intr_enable, 0);
 702                 del_timer(&fs->timeout);
 703                 fs->timeout_pending = 0;
 704                 act(fs);
 705                 break;
 706         case do_transfer:
 707                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
 708                         break;
 709                 out_8(&sw->intr_enable, 0);
 710                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
 711                 out_8(&sw->select, RELAX);
 712                 del_timer(&fs->timeout);
 713                 fs->timeout_pending = 0;
 714                 dr = fs->dma;
 715                 cp = fs->dma_cmd;
 716                 if (rq_data_dir(req) == WRITE)
 717                         ++cp;
 718                 /*
 719                  * Check that the main data transfer has finished.
 720                  * On writing, the swim3 sometimes doesn't use
 721                  * up all the bytes of the postamble, so we can still
 722                  * see DMA active here.  That doesn't matter as long
 723                  * as all the sector data has been transferred.
 724                  */
 725                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
 726                         /* wait a little while for DMA to complete */
 727                         for (n = 0; n < 100; ++n) {
 728                                 if (cp->xfer_status != 0)
 729                                         break;
 730                                 udelay(1);
 731                                 barrier();
 732                         }
 733                 }
 734                 /* turn off DMA */
 735                 out_le32(&dr->control, (RUN | PAUSE) << 16);
 736                 stat = le16_to_cpu(cp->xfer_status);
 737                 resid = le16_to_cpu(cp->res_count);
 738                 if (intr & ERROR_INTR) {
 739                         n = fs->scount - 1 - resid / 512;
 740                         if (n > 0) {
 741                                 blk_update_request(req, 0, n << 9);
 742                                 fs->req_sector += n;
 743                         }
 744                         if (fs->retries < 5) {
 745                                 ++fs->retries;
 746                                 act(fs);
 747                         } else {
 748                                 swim3_err("Error %sing block %ld (err=%x)\n",
 749                                        rq_data_dir(req) == WRITE? "writ": "read",
 750                                        (long)blk_rq_pos(req), err);
 751                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 752                                 fs->state = idle;
 753                         }
 754                 } else {
 755                         if ((stat & ACTIVE) == 0 || resid != 0) {
 756                                 /* musta been an error */
 757                                 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
 758                                 swim3_err("  state=%d, dir=%x, intr=%x, err=%x\n",
 759                                           fs->state, rq_data_dir(req), intr, err);
 760                                 swim3_end_request(fs, BLK_STS_IOERR, 0);
 761                                 fs->state = idle;
 762                                 break;
 763                         }
 764                         fs->retries = 0;
 765                         if (swim3_end_request(fs, 0, fs->scount << 9)) {
 766                                 fs->req_sector += fs->scount;
 767                                 if (fs->req_sector > fs->secpertrack) {
 768                                         fs->req_sector -= fs->secpertrack;
 769                                         if (++fs->head > 1) {
 770                                                 fs->head = 0;
 771                                                 ++fs->req_cyl;
 772                                         }
 773                                 }
 774                                 act(fs);
 775                         } else
 776                                 fs->state = idle;
 777                 }
 778                 break;
 779         default:
 780                 swim3_err("Don't know what to do in state %d\n", fs->state);
 781         }
 782         spin_unlock_irqrestore(&swim3_lock, flags);
 783         return IRQ_HANDLED;
 784 }
 785 
 786 /*
 787 static void fd_dma_interrupt(int irq, void *dev_id)
 788 {
 789 }
 790 */
 791 
 792 /* Called under the mutex to grab exclusive access to a drive */
 793 static int grab_drive(struct floppy_state *fs, enum swim_state state,
 794                       int interruptible)
 795 {
 796         unsigned long flags;
 797 
 798         swim3_dbg("%s", "-> grab drive\n");
 799 
 800         spin_lock_irqsave(&swim3_lock, flags);
 801         if (fs->state != idle && fs->state != available) {
 802                 ++fs->wanted;
 803                 /* this will enable irqs in order to sleep */
 804                 if (!interruptible)
 805                         wait_event_lock_irq(fs->wait,
 806                                         fs->state == available,
 807                                         swim3_lock);
 808                 else if (wait_event_interruptible_lock_irq(fs->wait,
 809                                         fs->state == available,
 810                                         swim3_lock)) {
 811                         --fs->wanted;
 812                         spin_unlock_irqrestore(&swim3_lock, flags);
 813                         return -EINTR;
 814                 }
 815                 --fs->wanted;
 816         }
 817         fs->state = state;
 818         spin_unlock_irqrestore(&swim3_lock, flags);
 819 
 820         return 0;
 821 }
 822 
 823 static void release_drive(struct floppy_state *fs)
 824 {
 825         struct request_queue *q = disks[fs->index]->queue;
 826         unsigned long flags;
 827 
 828         swim3_dbg("%s", "-> release drive\n");
 829 
 830         spin_lock_irqsave(&swim3_lock, flags);
 831         fs->state = idle;
 832         spin_unlock_irqrestore(&swim3_lock, flags);
 833 
 834         blk_mq_freeze_queue(q);
 835         blk_mq_quiesce_queue(q);
 836         blk_mq_unquiesce_queue(q);
 837         blk_mq_unfreeze_queue(q);
 838 }
 839 
 840 static int fd_eject(struct floppy_state *fs)
 841 {
 842         int err, n;
 843 
 844         err = grab_drive(fs, ejecting, 1);
 845         if (err)
 846                 return err;
 847         swim3_action(fs, EJECT);
 848         for (n = 20; n > 0; --n) {
 849                 if (signal_pending(current)) {
 850                         err = -EINTR;
 851                         break;
 852                 }
 853                 swim3_select(fs, RELAX);
 854                 schedule_timeout_interruptible(1);
 855                 if (swim3_readbit(fs, DISK_IN) == 0)
 856                         break;
 857         }
 858         swim3_select(fs, RELAX);
 859         udelay(150);
 860         fs->ejected = 1;
 861         release_drive(fs);
 862         return err;
 863 }
 864 
 865 static struct floppy_struct floppy_type =
 866         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
 867 
 868 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
 869                         unsigned int cmd, unsigned long param)
 870 {
 871         struct floppy_state *fs = bdev->bd_disk->private_data;
 872         int err;
 873                 
 874         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
 875                 return -EPERM;
 876 
 877         if (fs->mdev->media_bay &&
 878             check_media_bay(fs->mdev->media_bay) != MB_FD)
 879                 return -ENXIO;
 880 
 881         switch (cmd) {
 882         case FDEJECT:
 883                 if (fs->ref_count != 1)
 884                         return -EBUSY;
 885                 err = fd_eject(fs);
 886                 return err;
 887         case FDGETPRM:
 888                 if (copy_to_user((void __user *) param, &floppy_type,
 889                                  sizeof(struct floppy_struct)))
 890                         return -EFAULT;
 891                 return 0;
 892         }
 893         return -ENOTTY;
 894 }
 895 
 896 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 897                                  unsigned int cmd, unsigned long param)
 898 {
 899         int ret;
 900 
 901         mutex_lock(&swim3_mutex);
 902         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
 903         mutex_unlock(&swim3_mutex);
 904 
 905         return ret;
 906 }
 907 
 908 static int floppy_open(struct block_device *bdev, fmode_t mode)
 909 {
 910         struct floppy_state *fs = bdev->bd_disk->private_data;
 911         struct swim3 __iomem *sw = fs->swim3;
 912         int n, err = 0;
 913 
 914         if (fs->ref_count == 0) {
 915                 if (fs->mdev->media_bay &&
 916                     check_media_bay(fs->mdev->media_bay) != MB_FD)
 917                         return -ENXIO;
 918                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
 919                 out_8(&sw->control_bic, 0xff);
 920                 out_8(&sw->mode, 0x95);
 921                 udelay(10);
 922                 out_8(&sw->intr_enable, 0);
 923                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
 924                 swim3_action(fs, MOTOR_ON);
 925                 fs->write_prot = -1;
 926                 fs->cur_cyl = -1;
 927                 for (n = 0; n < 2 * HZ; ++n) {
 928                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
 929                                 break;
 930                         if (signal_pending(current)) {
 931                                 err = -EINTR;
 932                                 break;
 933                         }
 934                         swim3_select(fs, RELAX);
 935                         schedule_timeout_interruptible(1);
 936                 }
 937                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
 938                                  || swim3_readbit(fs, DISK_IN) == 0))
 939                         err = -ENXIO;
 940                 swim3_action(fs, SETMFM);
 941                 swim3_select(fs, RELAX);
 942 
 943         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
 944                 return -EBUSY;
 945 
 946         if (err == 0 && (mode & FMODE_NDELAY) == 0
 947             && (mode & (FMODE_READ|FMODE_WRITE))) {
 948                 check_disk_change(bdev);
 949                 if (fs->ejected)
 950                         err = -ENXIO;
 951         }
 952 
 953         if (err == 0 && (mode & FMODE_WRITE)) {
 954                 if (fs->write_prot < 0)
 955                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
 956                 if (fs->write_prot)
 957                         err = -EROFS;
 958         }
 959 
 960         if (err) {
 961                 if (fs->ref_count == 0) {
 962                         swim3_action(fs, MOTOR_OFF);
 963                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
 964                         swim3_select(fs, RELAX);
 965                 }
 966                 return err;
 967         }
 968 
 969         if (mode & FMODE_EXCL)
 970                 fs->ref_count = -1;
 971         else
 972                 ++fs->ref_count;
 973 
 974         return 0;
 975 }
 976 
 977 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 978 {
 979         int ret;
 980 
 981         mutex_lock(&swim3_mutex);
 982         ret = floppy_open(bdev, mode);
 983         mutex_unlock(&swim3_mutex);
 984 
 985         return ret;
 986 }
 987 
 988 static void floppy_release(struct gendisk *disk, fmode_t mode)
 989 {
 990         struct floppy_state *fs = disk->private_data;
 991         struct swim3 __iomem *sw = fs->swim3;
 992 
 993         mutex_lock(&swim3_mutex);
 994         if (fs->ref_count > 0)
 995                 --fs->ref_count;
 996         else if (fs->ref_count == -1)
 997                 fs->ref_count = 0;
 998         if (fs->ref_count == 0) {
 999                 swim3_action(fs, MOTOR_OFF);
1000                 out_8(&sw->control_bic, 0xff);
1001                 swim3_select(fs, RELAX);
1002         }
1003         mutex_unlock(&swim3_mutex);
1004 }
1005 
1006 static unsigned int floppy_check_events(struct gendisk *disk,
1007                                         unsigned int clearing)
1008 {
1009         struct floppy_state *fs = disk->private_data;
1010         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1011 }
1012 
1013 static int floppy_revalidate(struct gendisk *disk)
1014 {
1015         struct floppy_state *fs = disk->private_data;
1016         struct swim3 __iomem *sw;
1017         int ret, n;
1018 
1019         if (fs->mdev->media_bay &&
1020             check_media_bay(fs->mdev->media_bay) != MB_FD)
1021                 return -ENXIO;
1022 
1023         sw = fs->swim3;
1024         grab_drive(fs, revalidating, 0);
1025         out_8(&sw->intr_enable, 0);
1026         out_8(&sw->control_bis, DRIVE_ENABLE);
1027         swim3_action(fs, MOTOR_ON);     /* necessary? */
1028         fs->write_prot = -1;
1029         fs->cur_cyl = -1;
1030         mdelay(1);
1031         for (n = HZ; n > 0; --n) {
1032                 if (swim3_readbit(fs, SEEK_COMPLETE))
1033                         break;
1034                 if (signal_pending(current))
1035                         break;
1036                 swim3_select(fs, RELAX);
1037                 schedule_timeout_interruptible(1);
1038         }
1039         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1040                 || swim3_readbit(fs, DISK_IN) == 0;
1041         if (ret)
1042                 swim3_action(fs, MOTOR_OFF);
1043         else {
1044                 fs->ejected = 0;
1045                 swim3_action(fs, SETMFM);
1046         }
1047         swim3_select(fs, RELAX);
1048 
1049         release_drive(fs);
1050         return ret;
1051 }
1052 
1053 static const struct block_device_operations floppy_fops = {
1054         .open           = floppy_unlocked_open,
1055         .release        = floppy_release,
1056         .ioctl          = floppy_ioctl,
1057         .check_events   = floppy_check_events,
1058         .revalidate_disk= floppy_revalidate,
1059 };
1060 
1061 static const struct blk_mq_ops swim3_mq_ops = {
1062         .queue_rq = swim3_queue_rq,
1063 };
1064 
1065 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1066 {
1067         struct floppy_state *fs = macio_get_drvdata(mdev);
1068         struct swim3 __iomem *sw;
1069 
1070         if (!fs)
1071                 return;
1072 
1073         sw = fs->swim3;
1074 
1075         if (mb_state != MB_FD)
1076                 return;
1077 
1078         /* Clear state */
1079         out_8(&sw->intr_enable, 0);
1080         in_8(&sw->intr);
1081         in_8(&sw->error);
1082 }
1083 
1084 static int swim3_add_device(struct macio_dev *mdev, int index)
1085 {
1086         struct device_node *swim = mdev->ofdev.dev.of_node;
1087         struct floppy_state *fs = &floppy_states[index];
1088         int rc = -EBUSY;
1089 
1090         fs->mdev = mdev;
1091         fs->index = index;
1092 
1093         /* Check & Request resources */
1094         if (macio_resource_count(mdev) < 2) {
1095                 swim3_err("%s", "No address in device-tree\n");
1096                 return -ENXIO;
1097         }
1098         if (macio_irq_count(mdev) < 1) {
1099                 swim3_err("%s", "No interrupt in device-tree\n");
1100                 return -ENXIO;
1101         }
1102         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1103                 swim3_err("%s", "Can't request mmio resource\n");
1104                 return -EBUSY;
1105         }
1106         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1107                 swim3_err("%s", "Can't request dma resource\n");
1108                 macio_release_resource(mdev, 0);
1109                 return -EBUSY;
1110         }
1111         dev_set_drvdata(&mdev->ofdev.dev, fs);
1112 
1113         if (mdev->media_bay == NULL)
1114                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1115         
1116         fs->state = idle;
1117         fs->swim3 = (struct swim3 __iomem *)
1118                 ioremap(macio_resource_start(mdev, 0), 0x200);
1119         if (fs->swim3 == NULL) {
1120                 swim3_err("%s", "Couldn't map mmio registers\n");
1121                 rc = -ENOMEM;
1122                 goto out_release;
1123         }
1124         fs->dma = (struct dbdma_regs __iomem *)
1125                 ioremap(macio_resource_start(mdev, 1), 0x200);
1126         if (fs->dma == NULL) {
1127                 swim3_err("%s", "Couldn't map dma registers\n");
1128                 iounmap(fs->swim3);
1129                 rc = -ENOMEM;
1130                 goto out_release;
1131         }
1132         fs->swim3_intr = macio_irq(mdev, 0);
1133         fs->dma_intr = macio_irq(mdev, 1);
1134         fs->cur_cyl = -1;
1135         fs->cur_sector = -1;
1136         fs->secpercyl = 36;
1137         fs->secpertrack = 18;
1138         fs->total_secs = 2880;
1139         init_waitqueue_head(&fs->wait);
1140 
1141         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1142         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1143         fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP);
1144 
1145         if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1146                 swim3_mb_event(mdev, MB_FD);
1147 
1148         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1149                 swim3_err("%s", "Couldn't request interrupt\n");
1150                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1151                 goto out_unmap;
1152         }
1153 
1154         timer_setup(&fs->timeout, NULL, 0);
1155 
1156         swim3_info("SWIM3 floppy controller %s\n",
1157                 mdev->media_bay ? "in media bay" : "");
1158 
1159         return 0;
1160 
1161  out_unmap:
1162         iounmap(fs->dma);
1163         iounmap(fs->swim3);
1164 
1165  out_release:
1166         macio_release_resource(mdev, 0);
1167         macio_release_resource(mdev, 1);
1168 
1169         return rc;
1170 }
1171 
1172 static int swim3_attach(struct macio_dev *mdev,
1173                         const struct of_device_id *match)
1174 {
1175         struct floppy_state *fs;
1176         struct gendisk *disk;
1177         int rc;
1178 
1179         if (floppy_count >= MAX_FLOPPIES)
1180                 return -ENXIO;
1181 
1182         if (floppy_count == 0) {
1183                 rc = register_blkdev(FLOPPY_MAJOR, "fd");
1184                 if (rc)
1185                         return rc;
1186         }
1187 
1188         disk = alloc_disk(1);
1189         if (disk == NULL) {
1190                 rc = -ENOMEM;
1191                 goto out_unregister;
1192         }
1193 
1194         fs = &floppy_states[floppy_count];
1195         memset(fs, 0, sizeof(*fs));
1196 
1197         disk->queue = blk_mq_init_sq_queue(&fs->tag_set, &swim3_mq_ops, 2,
1198                                                 BLK_MQ_F_SHOULD_MERGE);
1199         if (IS_ERR(disk->queue)) {
1200                 rc = PTR_ERR(disk->queue);
1201                 disk->queue = NULL;
1202                 goto out_put_disk;
1203         }
1204         blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
1205         disk->queue->queuedata = fs;
1206 
1207         rc = swim3_add_device(mdev, floppy_count);
1208         if (rc)
1209                 goto out_cleanup_queue;
1210 
1211         disk->major = FLOPPY_MAJOR;
1212         disk->first_minor = floppy_count;
1213         disk->fops = &floppy_fops;
1214         disk->private_data = fs;
1215         disk->events = DISK_EVENT_MEDIA_CHANGE;
1216         disk->flags |= GENHD_FL_REMOVABLE;
1217         sprintf(disk->disk_name, "fd%d", floppy_count);
1218         set_capacity(disk, 2880);
1219         add_disk(disk);
1220 
1221         disks[floppy_count++] = disk;
1222         return 0;
1223 
1224 out_cleanup_queue:
1225         blk_cleanup_queue(disk->queue);
1226         disk->queue = NULL;
1227         blk_mq_free_tag_set(&fs->tag_set);
1228 out_put_disk:
1229         put_disk(disk);
1230 out_unregister:
1231         if (floppy_count == 0)
1232                 unregister_blkdev(FLOPPY_MAJOR, "fd");
1233         return rc;
1234 }
1235 
1236 static const struct of_device_id swim3_match[] =
1237 {
1238         {
1239         .name           = "swim3",
1240         },
1241         {
1242         .compatible     = "ohare-swim3"
1243         },
1244         {
1245         .compatible     = "swim3"
1246         },
1247         { /* end of list */ }
1248 };
1249 
1250 static struct macio_driver swim3_driver =
1251 {
1252         .driver = {
1253                 .name           = "swim3",
1254                 .of_match_table = swim3_match,
1255         },
1256         .probe          = swim3_attach,
1257 #ifdef CONFIG_PMAC_MEDIABAY
1258         .mediabay_event = swim3_mb_event,
1259 #endif
1260 #if 0
1261         .suspend        = swim3_suspend,
1262         .resume         = swim3_resume,
1263 #endif
1264 };
1265 
1266 
1267 int swim3_init(void)
1268 {
1269         macio_register_driver(&swim3_driver);
1270         return 0;
1271 }
1272 
1273 module_init(swim3_init)
1274 
1275 MODULE_LICENSE("GPL");
1276 MODULE_AUTHOR("Paul Mackerras");
1277 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/block/swim3.c

DEFINITIONS
